Random my Java

Scanner inputNumber = new Scanner(System.in);

System.out.println("Input amoun of number :");

int n = inputNumber.nextInt();

int []number = new int[n];

int []money = new int[n];

int costTotal = 0;

int total = 0;

int getMoney= 0;

int myNumber = 0;

System.out.println("input "+n+ " number:");

for(int i=0; i<number.length; i++) {

System.out.println("number =");

number[i] = inputNumber.nextInt();

System.out.println("Money =");

money[i] = inputNumber.nextInt();

total += money[i];

}

double numRandom = Math.random()*5;

int castNumRandom = (int)numRandom;

System.out.println("---------");

System.out.println("Number Tragon = "+castNumRandom);

System.out.println("---------");

System.out.println("Your spend moeney: " + total);

for(int k =0; k<number.length; k++) {

if(number[k] == castNumRandom) {

costTotal = money[k]*80;

myNumber = 100;break;

}

}

if(myNumber==100) {

getMoney = costTotal - total;

System.out.println("---------");

System.out.println("You get money: "+getMoney);

}else {

System.out.println("Thank! Try agian!");

}